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authorThomas Gleixner <tglx@linutronix.de>2019-04-14 18:59:56 +0300
committerBorislav Petkov <bp@suse.de>2019-04-17 16:05:32 +0300
commit1bdb67e5aa2d5d43c48cb7d93393fcba276c9e71 (patch)
tree871ff0cb4efb160ba8ecf9f82c2cc977659abf9d /arch/x86/include/asm/cpu_entry_area.h
parent3207426925d2b4da390be8068df1d1c2b36e5918 (diff)
downloadlinux-1bdb67e5aa2d5d43c48cb7d93393fcba276c9e71.tar.xz
x86/exceptions: Enable IST guard pages
All usage sites which expected that the exception stacks in the CPU entry area are mapped linearly are fixed up. Enable guard pages between the IST stacks. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Sean Christopherson <sean.j.christopherson@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20190414160145.349862042@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/cpu_entry_area.h')
-rw-r--r--arch/x86/include/asm/cpu_entry_area.h8
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/x86/include/asm/cpu_entry_area.h b/arch/x86/include/asm/cpu_entry_area.h
index 310eeb62d418..9c96406e6d2b 100644
--- a/arch/x86/include/asm/cpu_entry_area.h
+++ b/arch/x86/include/asm/cpu_entry_area.h
@@ -26,13 +26,9 @@ struct exception_stacks {
ESTACKS_MEMBERS(0)
};
-/*
- * The effective cpu entry area mapping with guard pages. Guard size is
- * zero until the code which makes assumptions about linear mappings is
- * cleaned up.
- */
+/* The effective cpu entry area mapping with guard pages. */
struct cea_exception_stacks {
- ESTACKS_MEMBERS(0)
+ ESTACKS_MEMBERS(PAGE_SIZE)
};
/*